X2 on what KRal has said. When it comes to bead blasting the scratches and dents need to be removed first. Otherwise they just simply get magnified once bead blasted.
Second choice is the maroon Scotch-Brite

Remember this that a fine Bead Blast can still get scratched.
As well as the scotch - brite.

If you are a DIY then you can spend almost as much money getting correct files and stones and etc for the same or less to have a professional do it.